ATLAS Trigger / current L1Calo Uli Schäfer 1 Jet/Energy module calo µ CTP L1

Current L1Calo : digital processors Sliding windows algorithms for jet and em cluster detection on processor modules at granularity ≥.1×.1 (η×φ) Data consolidation by thresholding and counting objects Data transmission on parallel backplane to mergers Global results determined by summation trees on daisy-chained merger modules Final results of electromagnetic and hadronic object count (at given thresholds), and total and missing transverse energy reported to Central Trigger Processor Topological information (Regions of Interest – ROIs – basically energy sums per window) sent to 2 nd level trigger only for all level-1 accepted events Uli Schäfer 2

upgrade : Topology So far topology of identified objects not propagated through 1 st level trigger real-time data path for bandwidth reason  Increase RTDP bandwidth and send (almost) full ROI information to a single processor stage where topology cuts are applied and double counting is suppressed by jet/electron/... matching : Increase backplane bandwidth of existent processor modules 4- fold (40Mb/s  160Mb/s) with modification to FPGA code only Replace the merger modules by “CMM++” modules Single FPGA processor 16*25bit*160Mb/s (=64Gb/s) parallel input capability Possibly up to ~400Gb/s optical I/O Backward compatible to current merger modules so as to allow for staged installation scenario Daisy-chain CMM++s electrically or optically similar to current scheme Star-couple all CMM++s into topological processor for maximum performance Uli Schäfer 3

New merger module: CMM++ Uli Schäfer 4 Legacy DAQ, ROI readout (Glink) SNAP12 Topological processor links: 12-fiber bundles, 6.4/10 Gbit/s/fiber Legacy LVDS outputs to CTP Virtex 6 HX565T Backplane data from JEM/CPM modules (160 MHz) LVDS merger links SNAP12 VME CPLD VME -- 9U × 40 cm

L1Calo Phase-1 Uli Schäfer 5 Daisy chained Combination of low-latency LVDS + high bandwidth opto links CMM++ Full system w. topo processor single crate

Demonstrators / Prototypes so far… Work on CMM++ prototype has started recently. Currently at specifications stage. VHDL system modelling started at MSU. “GOLD” demonstrator (not just) for a topological processor currently being developed in Mainz Latency  data replication schemes Density  processing power, connectivity Uli Schäfer 6 Mainz-built “BLT” backplane and link tester successfully verified 160Mb/s data reception on the processor backplane. Equipped with SNAP12 opto-link interface and LHC bunch clock jitter cleaning hardware required on CMM++

GOLD concept «data concentrator» scheme: many in – few out Advanced TCA form factor Limited connectivity on front panel Input links via optical connectors in zone 3 12-channel 10Gb/s opto modules on daughter card Electrical connectivity up to 10Gb/s in zone 2 Power budget ~400W Uli Schäfer 7 RTM front ATCA Z2 Z3 back

GOLD floor plan Uli Schäfer 8 Z1 Z2 Z3 Opto L L L L H H HH 5 * XC6VLX FPGAs (Processor L, merger M) up to 36 links each Two pairs of XC6VHX FPGAs (H) 72 links channel optos on daughter Clock generation 144 multigigabit links in zone 2 (equiv bit / BC) M 890Gb/s total

Optics & module status Uli Schäfer 9 Module currently being hand-routed (~ 400 differential pairs per FPGA) Daughter modules yet to be designed up to 72 fibres per connector (MPO/MTP )

3-d model Uli Schäfer 10

Current activities Write GOLD specs Get GOLD ready for production (check schematics) Get started with GOLD firmware : test f/w,  algorithmic f/w On-line s/w (Linux, VME SBC initially  ???) Get VME/GOLD adapter ready Get new copy of BLT up Add 12-channel opto daughter to BLT : Avago rather than SNAP12 Uli Schäfer 11